Frame structure for construction machine

Abstract

A bulldozer is provided with a boat shaped main frame and a substantially U-shaped gate frame as a frame structure that mounts a cap having a rollover protection structure (ROPS) and forms the skeleton of the bulldozer. The gate frame is installed on the upper portion of the main frame, has a pair of left and right columns that are disposed along a substantially vertical direction, and has a beam that connects the upper ends thereof. Mount units for mounting the cab and stopper units for firmly grasping the cab are arranged on the upper surface of the beam.

1. A frame structure for a construction machine that mounts a cab employing a rollover protection structure, comprising:
 a main frame; and 
 a substantially U-shaped gate frame that is installed on an upper portion of the main frame, and has a pair of columns that extend in a substantially vertical direction, and a beam that is disposed along a substantially horizontal direction so as to connect upper portions of the pair of columns; 
 wherein mount units which mount the cab, and stopper units that are disposed adjacent to the mounts units and connect the cab and the gate frame in an undetachable state, are respectively formed on an upper surface of the beam of the gate frame. 
 
   
   
     2. A frame structure for a construction machine that mounts a cab employing a rollover protection structure, comprising:
 a main frame; and 
 a substantially U-shaped gate frame that is installed on an upper portion of the main frame, and has a pair of columns that extend in a substantially vertical direction, and a beam that is disposed along a substantially horizontal direction so as to connect upper portions of the pair of columns; 
 wherein mount units which mount the cab, and stopper units that connect the cab and the gate frame, are respectively formed on an upper surface of the beam of the gate frame, and 
 wherein a radiator is fixed to the gate frame in a suspended state. 
 
   
   
     3. The frame structure of a construction machine according to  claim 2 , wherein the gate frame is disposed on the rear of the main frame, and the radiator is installed on the rear side of the gate frame. 
   
   
     4. A frame structure for a construction machine that mounts a cab employing a rollover protection structure, comprising:
 a main frame; and 
 a substantially U-shaped gate frame that is installed on an upper portion of the main frame, and has a pair of columns that extend in a substantially vertical direction, and a beam that is disposed along a substantially horizontal direction so as to connect upper portions of the pair of columns; 
 wherein mount units which mount the cab, and stopper units that connect the cab and the gate frame, are respectively formed on an upper surface of the beam of the gate frame, and 
 wherein the gate frame is in contact with a portion of a fuel tank and a hydraulic oil tank installed on the main frame. 
 
   
   
     5. The frame structure of a construction machine according to  claim 1 , wherein the rear portion of the cab is mounted on the gate frame; and
 the upper surface of the beam of the gate frame is tilted downward toward the front. 
 
   
   
     6. The frame structure of a construction machine according to  claim 2 , wherein the gate frame is in contact with a portion of a fuel tank and a hydraulic oil tank installed on the main frame. 
   
   
     7. The frame structure of a construction machine according to  claim 3 , wherein the gate frame is in contact with a portion of a fuel tank and a hydraulic oil tank installed on the main frame. 
   
   
     8. The frame structure of a construction machine according to  claim 2 , wherein the rear portion of the cab is mounted on the gate frame; and
 the upper surface of the beam in the gate frame is tilted downward toward the front. 
 
   
   
     9. The frame structure of a construction machine according to  claim 3 , wherein the rear portion of the cab is mounted on the gate frame; and
 the upper surface of the beam in the gate frame is tilted downward toward the front. 
 
   
   
     10. The frame structure of a construction machine according to  claim 4 , wherein the rear portion of the cab is mounted on the gate frame; and
 the upper surface of the beam in the gate frame is tilted downward toward the front. 
 
   
   
     11. The frame structure of a construction machine according to  claim 1 , further comprising:
 second mount units, which mount the cab, and second stopper units that are disposed adjacent to the second mount units and connect the cab and the main frame in an undetachable state, respectively formed on an upper surface of the main frame.